Geodesic
New method of defining quasiaverages
Teoretičeskaâ i matematičeskaâ fizika, Tome 5 (1970) no. 1, pp. 136-146

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Attention is drawn to some difficulties connected with the definition of quasiaverages for model systems. A new method is developed for introducing an auxiliary system and defining quasiaverages for a large class of model systems that contain a negative four-fermion interaction. As a subsidiary result, the solution is given to the problem of the limit expressions for the free energy (in the limit $V\to\infty$). 
@article{TMF_1970_5_1_a12,
     author = {N. N. Bogolyubov (Jr.)},
     title = {New method of defining quasiaverages},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {136--146},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1970_5_1_a12/}
}
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N. N. Bogolyubov (Jr.). New method of defining quasiaverages. Teoretičeskaâ i matematičeskaâ fizika, Tome 5 (1970) no. 1, pp. 136-146. http://geodesic.mathdoc.fr/item/TMF_1970_5_1_a12/